Weighing scale



Apr, 17, 1923.v y 1,451,684

H. CUMMER WEIGHING-SCALE Filed Feb. 11, '1921 annui HARRY C Applicationfiled February 11, 1921.

To @ZZ whom t may concern.'

1,451,684c UNITED STATES PATENT OFFICE.,

UMMER, or BUFFALO, NEW YORK.

WEIGHING SCALE.

Be it known that HARRY CUMMER, a citizen of the United States, residingat Buffalo, in the county of Erie and State of New 5 York, has inventedcertain new Improvements in Weighing Scal the following is aspecification.

and use ful es, of which' This invention relates to improvements iiiweighing scales of the type my prior United States Patents,

486 of October disclosed in N os. 1,076,-

21, 1913, and 1,185,634 of June 6, 1916. Such type is essentiallycharacterized by rocker beams in parallel planes and by the provision onone or more of the beams of a series of bearing beams tilting points,the

from point to point and ultimately coming to rest on two adjacentbearing points of the series.

This type of scale while useful generally for the purpose of commercialweighing is especially adapted to the weighing matter for the reasonsthat it is of postal self-acting,

that it gives a quick and certain registry of the weight of the articleon the 25 and that it may readily be made on a small excess scale pan tooperate This excess, as it is called, is the fraction of weight over andabove the prescribed unit of weight which is required to tip the beam ofan ordinary balance scale, such as is commonly used for weighing postalmaterial.

The invention is directed to the construction of the rocker beam and theassociated bearing points and consists in novel details the essentialobjects of insuring structure and organization which serve theengagement of the bearing points with the supporting surface along linesnormal to the longitudinal plane strength which is not affected spacingof the points, of virtual of the beam, of providing said points onprojections of great intrinsic by the mutual ly eliminating wear on thebearing points, of maintaining the mutual operative alinemcnt of saidpoints, of increasing the strength and rigidity of the beam and ofincreasing the sensitiveness of action.

Such objects insure the accuracy of the scale, its long efficient life,

the permanence of its accuracy duction to a minimum degree and the reofthe eX- cess7 weight necessary to register a full unit of weightconsistent with requirements according to which units, e. g., ounces asin domestic ice, are charged for as full un the postal fractions ofpostal servits.

Serial No. 444,269.

The invention is illustrated in the accompanying drawings, wherein:

Figure l is a side elevation of a rocker beam.

Figure 2 is a detail cross section on the line 2-2 of Figure 1 showingthe arrangement of the bearing points.

Figure 3 is a detail longitudinal section of the same.

Figure 4 is beam having struction.

Figure 5 is a detail cross section on the line 5-5 of Figure 4 showing amodified or alternative construction.

Figure 6 is a detail longitudinal section of the modified construction.

According to the invention the bearing points are provided bystructurally independent bodies and are preferably ball points. By theterm ball point is meant a point in a circle or other regular convexcurve lying in the plane of the beam in contradistinction to the sharpspur or knife-edge points disclosed in my prior patents.' These ballpoints are preferably provided either by a series of balls 1 as inFigures 1-3 or by a series of discs 2, as in Figures 4-6, which balls ordiscs are examples of structurally independent bodies within the scopeof the invention and are of hardened steel or other suitable materialand have the advantage of being substantially wear-proof at theirengaging points. The ball points provide the tread of the beam and, ofcourse, lie in the proper curve for the tread. The structurallyindependent bodies have the advantages of being capable of productionwith great accuracy and with requisite hardness and of being adapted forany mutual spacing that may be necessar57 in a particular case.

The rocker beam is provided with a tread portion 3 whose underfaceconforms to the curvature of the tread and forms the base of a channelin which the balls 1 ai'ev arranged. A suitable wear-strip 4 may beiitted against the underface of the tread portion 3 to take the wear ofthe balls 1, the strip 4 preferably being of hardened steel. The channelfor the balls 1 is completed by side plates 5 which are secured to thetread portion 3 by rivets 6 or otherwise suitably. As fitted in thechannel the balls 1 are retained by thin plates 7 of suitable resilientmetal whose outer edge portions are inturned as shown in Figure 3,therebygripping the balls and v at suitable intervals in the channelfrom end td end 7thereof` and may be secured by means of suitable'cement 8"as shown in Figure 3 or in any other suitablek manner.

Referring to Figures 4-,61

- These figures show the arrangement of the discs Qiwliich, incemparison with the balls l,`"ha've"the advantage of enabling thebearing points to be arranged at much closer intervals, as may benecessitated by particular`ci`rct'ims'tances and requirements ot use.

Vhere the discs 2 are employed they are preferably arranged in parallelrows, their planes coinciding with thelongitudinal' planes`v ofthe treadportion and the discs of one rowoverlapping the adjoining discs of theother row. Instead of the plates 7 used torV the retention of the ballsl, filler strips 7"1 may be providedto take up the space between lthediscs and the plates 5. As inthe previous'embodiment the discs may beheld at appropriate intervals by suitable cement.

"Ihe invention is not concerned with the structural details of thescale, such as the supporting base, the scale pan and the indicatingmechanism andtherefore such details are not illustrated. It may be notedthat a rocker beam of the general type shown in Figure 6 of my PatentNo. 1,185,634 has been selected for illustration lmerely by way ofexample.

Having fully described my invention, I claim`i"` A l. In a weighingscale of the type which includes e rocker "beam a series f Structurallyindependent bedies carried by said beam and arranged @lelie the tread.th'eret.

said] bodies PrO the beam may tipl 2. Ina weighing scale of the typewhichV includes a rocker beam, a Qhanhel'cnfolmingto the tread of saidbeam and structur-v ally independent bodiesA fitted in andprojectingbeyondy said channel, said b9dies pro} viding ball points on whichfthebeamy may tip?. A

3. In a weighing scale of the type which includes "aroeken beam having aconvex tread, a series of structurally independent bodies carried bysaid beamk and channel means for supporting said bodiesalong. saidconvex tread, said'bodies4 providing bearing points on which the beammay tip.

"img @el pees @which 4. Inx a` weighing scalefofthe type which includesla rocker beam, a 'series 'of projec tionsalon'g andl conformingto thetread of saidbeam and providingball points on wh'ichthe beani may tip.'i

" In testimony whereof I affix myv signature. i

HARRY

